hailey the weed

I took Hailey in to get her butt checked and they said it was an infection brought on by diaper rash. She keeps getting them...we think it might be from teething. Some people say the two are connected..Anyway..they had to weigh her.. She has gained 8 ounces since the 14th... She now weighs 20lbs 7.1 oz 27 1/4 in long.